<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>给一段文章中的全部指定词语进行过滤</title>
</head>
<body>
    <!-- // 比如我要过滤 "SM"
    var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd'
    需要结果
    asdasd**asdasdasd**sdasdasd** -->
    <script>
 var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd';
 var res=str.replace('SM','**')
 while(res.indexOf('SM')!==-1){
     res=res.replace('SM','**')
    //  进行二者替换 
 }
 console.log(res);
    </script>
    
</body>
</html>